change defined() to 0/1 check (#5599)

src/platforms/rcore_template.c

@@ -405,7 +405,7 @@ const char *GetKeyName(int key)
 // Register all input events
 void PollInputEvents(void)
 {
-#if defined(SUPPORT_GESTURES_SYSTEM)
+#if SUPPORT_GESTURES_SYSTEM
     // NOTE: Gestures update must be called every frame to reset gestures correctly
     // because ProcessGestureEvent() is just called on an event, not every frame
     UpdateGestures();